Compilare: main.cpp: In function 'bigint find_order(std::string)': main.cpp:407:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 407 | for(int i = 1; i <= s.size(); i++) nr_perm = nr_perm * i; | ~~^~~~~~~~~~~ main.cpp:418:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 418 | for(int poz = 0; poz < s.size(); poz++) { | ~~~~^~~~~~~~~~ main.cpp: In function 'std::string find_nth(bigint, std::string)': main.cpp:442:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 442 | for(int i = 1; i <= _s.size(); i++) nr_perm = nr_perm * i; | ~~^~~~~~~~~~~~ main.cpp:449:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 449 | for(int poz = 0; poz < s.size(); poz++) { | ~~~~^~~~~~~~~~